Mn1-xZnxFe2O4(x= 0, 0.1, 0.2, 0.3, 0.4, 0.5) are synthesized using sintering coprecipitation method. The coprecipitation retains from 0 hours to 48 hours at 1200 °C. The synthesis of a Mn0.6Zn0.4Fe2O4is almost completed even though retaining time is for 0 hours at 1200 °C. The crystal growth of Mn0.6Zn0.4Fe2O4particles proceeds rapidly retaining up to 6 hours and saturates retaining more than 6 hours at 1200 °C. The permeability and the electric resistivity are affected by the crystal growth of Mn0.6Zn0.4Fe2O4particles.

Mn0.7Zn0.3Fe2O4 is synthesized by sintering the nanosize precursor with sintering aids, which is synthesized by the coprecipitation method. The crystal growth of Mn0.7Zn0.3Fe2O4 is controlled by the amount of sintering aids. Complex permeability is explained by the Maxwell-Garnett (MG) effective medium model. The ferromagnetic resonance frequency more than 1 GHz can be explained by the shape anisotropy under the sintering process of the Mn0.7Zn0.3Fe2O4 particles. These results suggest possibility of Mn0.7Zn0.3Fe2O4 as a high frequency device material.

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